Docker use node 16 and udev, generic debian base.

DOCKER.md

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+# lw.comm-server Docker Builds
+
+This guide assumes some familiarity with [Docker](https://www.docker.com/), if you are new to Docker please start at: https://docs.docker.com/get-started/
+
+Docker user targets:
+- dev (default)
+
+## Dev
+You can build and run lw.comm-server in Docker using the commands below.
+- build development image:
+```
+docker build -t lw.comm-server .
+```
+- run image:
+```
+docker run -it --device=/dev/ttyUSB0 --rm -p 8000:8000 --cap-add=sys_nice lw.comm-server
+```
+- Connect to app: http://localhost:8000
+
+- Change the `--device=` to point to the correct USB device if necesscary, eg `--device=/dev/ttyACM0` etc.
+- To use a different port change the port mapping in the `docker run` command to `<port number>:8000` and adjust the url you connect to appropriately.
+
+## Run in background
+If you add `-d` to the docker run command it will start the container in detached mode.
+You can use `docker logs -f <uuid>` to follow the output of this, and `docker stop <uuid>` to stop it.
+
+## Allow hot plugging & selection of connected devices
+**This is NOT recommended, since it involves running the container in `--privileged` mode, which is a [potential security risk](https://docs.docker.com/engine/reference/run/#runtime-privilege-and-linux-capabilities).**
+
+_..you have been warned.._
+
+- run image:
+```
+docker run -it -v /dev:/dev --rm -p 8000:8000 --cap-add=sys_nice --privileged lw.comm-server
+```
+- when you connect the app you should be able to see all USB devices in the selection list
+

Dockerfile

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-FROM resin/raspberrypi3-node:10
+FROM node:16-bullseye AS base
+#FROM resin/raspberrypi3-node:10
 
 ADD config.js grblStrings.js firmwareFeatures.js LICENSE lw.comm-server.service package.json README.md server.js version.txt /laserweb/
 ADD app /laserweb/app/
 
-RUN cd /laserweb && npm install
+# Set up Apt, install build tooling and udev
+RUN apt update
+RUN apt install -y build-essential udev
 
+# Expose the port the container will serve on
 EXPOSE 8000
 
+FROM base AS comm-server
+
+# Build lw.comm-server
+RUN cd /laserweb && npm install
+
+FROM comm-server AS dev
+
+# Add the start script
 ADD docker_entrypoint.sh /
 
+# Entrypoint (defaulted)
 ENTRYPOINT ["/docker_entrypoint.sh"]
 CMD []
+
+# Bash shell for debug
+from comm-server as bash
+ENTRYPOINT ["/bin/bash"]